return {
    "hrsh7th/nvim-cmp",
    event = { "InsertEnter", "CmdlineEnter" },
    dependencies = {
        'neovim/nvim-lspconfig',
        'hrsh7th/cmp-nvim-lsp',
        'hrsh7th/cmp-buffer',
        'hrsh7th/cmp-path',
        'hrsh7th/cmp-cmdline',
        'L3MON4D3/LuaSnip',
        'saadparwaiz1/cmp_luasnip',
    },
    config = function()
        local cmp = require 'cmp'

        local has_words_before = function()
            unpack = unpack or table.unpack
            local line, col = unpack(vim.api.nvim_win_get_cursor(0))
            return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
        end

        local luasnip = require("luasnip")

        cmp.setup({
            snippet = {
                -- REQUIRED - you must specify a snippet engine
                expand = function(args)
                    -- vim.fn["vsnip#anonymous"](args.body)     -- For `vsnip` users.
                    require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
                    -- require('snippy').expand_snippet(args.body) -- For `snippy` users.
                    -- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
                end,
            },
            window = {
                -- completion = cmp.config.window.bordered(),
                -- documentation = cmp.config.window.bordered(),
            },

            mapping = {
                ['<C-Space>'] = cmp.mapping.complete({ "i", "s"}),
                ['<C-e>'] = cmp.mapping.abort({ "i", "s"}) ,
                ['<CR>'] = cmp.mapping.confirm({ select = true }, { "i", "s" }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items. }),
                ["<Tab>"] = cmp.mapping(function(fallback)
                    if cmp.visible() then
                        cmp.select_next_item()
                        -- You could replace the expand_or_jumpable() calls with expand_or_locally_jumpable()
                        -- that way you will only jump inside the snippet region
                    elseif luasnip.expand_or_jumpable() then
                        luasnip.expand_or_jump()
                    elseif has_words_before() then
                        cmp.complete()
                    else
                        fallback()
                    end
                end, { "i", "s" }),

                ["<S-Tab>"] = cmp.mapping(function(fallback)
                    if cmp.visible() then
                        cmp.select_prev_item()
                    elseif luasnip.jumpable(-1) then
                        luasnip.jump(-1)
                    else
                        fallback()
                    end
                end, { "i", "s" }),

                -- ["<C-E>"] = cmp.mapping(function(fallback)
                --     if cmp.visible() then
                --         cmp.select_next_item()
                --         -- You could replace the expand_or_jumpable() calls with expand_or_locally_jumpable()
                --         -- that way you will only jump inside the snippet region
                --     elseif luasnip.choice_active() then
                --         luasnip.change_choice(1)
                --     elseif has_words_before() then
                --         cmp.complete()
                --     else
                --         fallback()
                --     end
                -- end, { "i", "s" }),
            },

            sources = cmp.config.sources({
                { name = 'nvim_lsp' },
                -- { name = 'vsnip' }, -- For vsnip users.
                { name = 'luasnip' }, -- For luasnip users.
                -- { name = 'ultisnips' }, -- For ultisnips users.
                -- { name = 'snippy' }, -- For snippy users.
            }, {
                { name = 'buffer' },
            })
        })

        -- Set configuration for specific filetype.
        cmp.setup.filetype('gitcommit', {
            sources = cmp.config.sources({
                { name = 'git' }, -- You can specify the `git` source if [you were installed it](https://github.com/petertriho/cmp-git).
            }, {
                { name = 'buffer' },
            })
        })

        -- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
        cmp.setup.cmdline({ '/', '?' }, {
            mapping = cmp.mapping.preset.cmdline(),
            sources = {
                { name = 'buffer' }
            }
        })

        -- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
        cmp.setup.cmdline(':', {
            mapping = cmp.mapping.preset.cmdline(),
            sources = cmp.config.sources({
                { name = 'path' }
            }, {
                { name = 'cmdline' }
            })
        })
    end,
}
